Sourdough starter!! Smelt like rotten eggs...

I was trying to make my first sourdough starter! Here is the recipe I was using from takebackthebread.com

Ingredients:

4 cups of white all purpose flour

3-4 potatoes

6 cups of water

2 tablespoons of honey

2 teaspoons of salt

I let it set for three days! The top of the starter kind of bubbled but looked a little BLACK on top!! Not sure if It should look that way! Steve the bread guy's didn't look close to mine! It smelt like rotting eggs!!! I still tried to use it to make my sourdough bread... But my dough did not rise at all!!! Here is the recipe for the sourdough bread!